Rotary screen



J. A. WHITE ROTARY SCREEN Feb. 2a', 1932,

Filed Dot. 31. 1930 3 Sheets-Sheet 1 Feb. 23, 1932.

J. AQ WHITE .ROTARY SCREEN Filed oct. 51, 1930 .3 sheets-sheet 2 "E /gr /9 Z i 4 fg 5 ,z sa 49526 f f v 25a l Z( l 29 f l 'Z 6 y J 4 '/i /8 57 i I /7 /7 1 ,l zo

l *A i .f r L I #Hw Z/ 'L 47 1 H @www J. A. WHITE ROTARY SCREEN Feb. 23,1932.

Filed Oct.L 31, 1930 Patented Feb. 23, 19,32

" UNITED STATES;

WHITE coMPANY,o'F PHILADELPHIA, PE1\n\TsYI.vA.NIA,Y 'A 'coRPoRATIoN or PENN-Y' SYLVANIA A wenn JOSEPH A. WHITE, or MELROSE PARK, PENNSYLVANIA; AssIeNoR ToV TIIE iaceRE' sa' ROTARY scREENr lApplication led October 3 1, 1930. Serial No;492,592.A

invention relates to certain 'improvements in rotary screens 'for paper stock.`

One object of my invention lis Lto so design the mechanism that the paper stock will pass 'B through" the rotary screen. from the inside tothe outside, and the action of the diaphragme, Which are located on the outside of the cylinder, will be to force the Waterfrom screened stock hack through the screens, into the un-V 10 screened stock, thus making the screening process more efficient.

A further object of the invention is to makev a clean pulp kand to prevent *strain onthe diaphragms. Y. 15 The invention also .relates to the ymechanism for operating the diaphragme.

In the accompanying draWingsa-e-` Fig. 1 is a longitudinal sectional view of my improved rota-ry screen; f

Fig. 2.is an end View.; ,Y Fig; 3 is a transverse sectional view on the line 3 3, Fig.v 1;v Y y Fig. l is a plan View;

25' andA bumpers.

Referring to the .diiavvingsiiwl-l 'aretheV end frames of the machine. Extending from 3U oneend ofthe frame to the other is a semicircular vat 2, inV thepresent instance, made" whichv the stock passes from the4 interiorof thescreen to the vat. Eachhead`- 6V consists of a huh 9, connected to aring 1Q by spokes 11, so that the liquid canffreely flow through these heads'. f I VTailings feedingplates 12'project into the screen from tWo. of the ribs in the present instance, and these plates are loeveled[fromy the vinlet end of the machine'totvards tail-` f Fig. 5 is a detachedview of thea-ecker har ;U

Fig. 6 isa detachedV vievvfoflone ofthe in der 5. This screen hasopen heads@v and aV Aseries of longitudinalribs V7, fandV between these, ribs are-the screen plates 8, through ings outlet.' "The plates attheir vouterendsas at 13, to form -scoops `to more readily carry Vthe tailings. f'lhis,arrange-4 ment causes thetailings .to he conducted vto i the discharge end of the screen, preventing the tailings -becoming 'broken up and difficult to remove.v I

. The screen is driven from one end of the machine and on the trunnion 4: at this end of the machine is a gear Wheel-145, which meshes with any suitahledriving gear@ Between the screen .and the-vat are two sets ofcurved diaphragms 15.., These diaphragms `are perfo? Y rated at intervals asshjovvn. The diaphragms are carried by levers A,16, \-piv'otally mounted A on longitudinalshafts 17 {extendi-ngthe full 1 length ofl the machine. These shafts'have their hearings in boxes 18von the end frames 1.--1. The inner arm of each l'everiscurvedfl as shown in Fig. 3, and extends Well into the vat. `The inner arm 19 of eachV lever isse- 1 curelyattached toa diaphragm 15. The out-V Y er arm120. of each leverextendsjon the out- Yside of the vat, as shovvnfclearly in Fig. 3.-v

At onev side of thema'chine isa Ipowershaft 21. mountedin suitable bearings 22, and on this shaft aretvvoeccentrics 23.' The strap 24 offeach eccentric 'has'an arm 24a, andi j resting on this armis a block 25, Which eX-j tends into a socket 25a in` an arm 2 0 lon'the' 80 side of the machine.. `Thetvvo arms on' the side of themachine next tothe shaft 21 are spacedapart, and each arm isactuated by an ecY i independent eccentric on theshaft, so that as' the shaft rotates the arms fare reciprocated,

and t'hisxmotion Vis imparted to the da?. f phragrns 15, causing them v .to move tofand fromthe perforated peripheryof the cyl-- inder 5.v In'order to impart a like movementv tothe levers 16j on the opposite side of themachine, the levers on the shaft of the machine are lconnec'zted'tothosefon thecppositef side by a bar 3.1;; Each har extends finto aV socket in the two levers, as shovvn clearly in Fig. '3, so thatfvvhen the v,eccentric reciprocates,r

the opposite lever'is reciprocated in Vthe same i manner. The'twoeccentrics on the .shaft21- 'f are set opposite each other,so'tha ti1vvhen one setfof diaphragms ismovingtowardsfthe 'cyl-Vy Q inder, the `other-'set of diaphragins i`s n uov.j

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chine. Each end of; the rocker 30.is notched at 48 and engages the armsQO of the levers y on that side of the machine,v so that when motion is: impartedto one set.. of levers, this motion:y is. transmitted;- to .the otherset,r inV suring the positive action of both sets o1 diaphragms without lost motion. A iexible bumper 49 is located in back ofeach end of the rocker 30. kThese bumpers'areasecurfek to a plate 50, which plate is attached to the bar-46 in thev sameinanneras 'theplate^45, the

bumpers preventing chattering of the parts.v Byithisconstfruction there is a substantially continuous" movement of thef stock` tlirouglr thescreen.:V l I 32`-i`s the-inlet to theinteri'oroffthoscreen and 33 is the outlet from the vat. The'water is discharged from this outlet'overffa' weir 34g' so thatftli'e wat-er in :the -vatl1will 'bei of givenilieight At theoppositeendotthe ma chine` i's av tailings; receptacle 35; which Yrethis-ende ofi the screen "is f a bucketL 36, which cli-peinteV -thistailingsreceptaclei35p; removing certainr amount; off the5 tailingsand; dischargingit'fintoal hopperl 37;' r Wliiclidirects Y them' to la! point" outside -fofth'ef nlach'ine.I

lV'hil'einthedrawings I-have'lshowna dip;V

per for: pickingfup "the-'liquidi and discharging itinto ar hopper 87; iirsome'instances thisdippen ;may\f bel dispensed fwith, without de- Pmfngifromftheessential features ofltheinr: yventiony` .v

In orderM to'A closey vfthe space between each end frame f1. andfthe headVj ofl the icylindrical screen below the 'water"line",` suitable' packing j SSiis used'. vAt* one endofthe lvat -is an open'-V ingclsedbyacap39;,and'in order todiainf cap; dischargevalve 40'lils 'loc-ated atl the'- lowestlpoint-oftthe vattf 41iisalrainingjrallve l I fr the outlet 635i and", 42" is, a drainage Ivalve for theta'ilings'receptacle.\ Iiisome'instances7 in orderto clean the-screens thoroughly Va iet pipe 432m lcated'at'eitherfsilefof the cylinder above =its center 'ofl rotation; y'acc'o'rding to thel direction 'of "rotation fofi this -screen'^,` l

and lwaterf iets;` from. the pipe pl'ay `upon the screensofgthe-cylindeiandidislodgen any Aintothegtaligs receptacle, andtheyare removedfrom' this freceptacle'by thfe bucket 3,6.'

yThe diaphragms beinglcated inthe vat out-A side the cylnfdr antifa-me screen stock, they' return- Ywith Ywatergbaclcto thef cylinder.v The action; of. the diaphragmeoutsideV the-.cylinder forces the water froln screened;-stoelenback thnoughq-the plates into the unscreened'stock, thus making the screening process much morefecienta- 'lhe` screening action due to the movement of the diaphragme is caused by suction 4insteadolcy pressurepas in the cas-e of screens' screening from the outsideL ofthe cylinder` to; the inside thereof-5 Th'e present construction makes clear` strainsl on the diaphragm.- E clainr:-4 E v l'. fThecombina-tionin arotaryfscreen, ofa

vat a' cylindrical screen mounted in` thel vat; diaphragms located; bet-Ween the Yscreen and; e thei'nnenwalls ol" thevat'ymeai'is' for vibratl" ring said diaphragme; an inlet; for the stock; Y celves the tailings y irom the screeny as they areifd f'omthe screen, and onV the {liead aty communicatingwith th'einterior of the cyvib'rated the stockiwillfbezdrawnthroughthe screen into' tlilevat f, and; atailings receptacle'- pulp and: prevents1 at the endof-'the screenloppositetolthe:inlet l opening.

2. The combination'finarotary' screen; ol

a Vat; a cylindrical screenl monn't'edfin'i'the vat; vdiaphragmev located -between the-screen andthe inner walls of the vat; means' for vi= bratingvsaid diaphragms; an" inlet forv'itiie stock, communicating withthe'interior of'the cylindrical screen; .adischarge communicatingk with4 the vatg so thatas' the* diaphragms arecvibrated thestock will be drawn.through"` the' screen into` the' vat tailings receptacle Y at' the endfo'f the screenopposite tothe 'inlet' opening; a bucket'carriedfbyv thes'creensand arranged'to remove the tailings from' thetaili' ings receptacle; landaliopperfinto which thel tailings are discharged fromthe loucketr r f The `combination in arcta'iyscreen,v of; twok endi frames a semi-cylindricalnl vatfloi' cated between Vthe end frames; a cylindrical:

screenv openat each-endand'partly submerged Vwithin t'lie vatga trunniorrateaclrendiofthe screen; Vbearings 1n- Whl'clithe tiunnions are mounted to allow the screen ito" be rotated;l

aninletat'one end ofthe machine communi#V cating with the interior'ofthe rotaryfs'creen:r`

an .outletatV the same {endrof'vthejmaehine communicatingwithy the vat.; a tailings 'receptacle at'theopposite endzof'the machine`.

its

and communicatingwith the .interior ofthe Y screen; means within the Vscreen ,for directing the tailings" to the tailings;receptacle* .and means for remoying the tailings lfrom'the tailingsreceptacle'.

4. The combination in a rotary screen, .ofk a frame at each end of the machine; a semi-Y cylindrical vat mounted between the frames; a rotary screen partly submerged within the vat, said screen being open at each end; an inlet for the stock at one end of the machine communicating with the interior of the screen; a discharge opening for the vstock communicating with the vat at the same endv of the machine as the inletopening; a tailings receptacle at the opposite end of the machine and communicating with the interior of the screen; and longitudinal tailings feeding Vplates projecting from the inner walls' of the screen for directing the tailings towards the tailings receptacle. Y

5. Thecombination in a rotary screen, of a frame at each end of the mac-hine;.a semicylindrical vat mounted between the frames; a rotary screen partly submerged within the vat, said screen being open at each end; an

inlet for the stock at one end of the machine communicating with the interior of the screen a discharge opening for the stock communicating with the vat at the same end of the machine as the inlet opening;` a tailings receptacle at the opposite endof the machine and communicating with the Vinterior of the screen; and longitudinal tailings feeding plates projecting from the inner walls of the screen, said plates being curved at their outer edges to carry the tailings to the tailings receptacle.

6. The. combination in arotary screen, of a vat; a rotary screen partly submerged within the vat, said screen being open atk each end; an inlet for the stock discharging Vphragms; a shaft on which the cams are a vat; a'cylinder in the vat; means forV rotating the cylinder; twosete of diaphragme between the cylinder and the bottom` of the vat; a cam for operating each set of dia-V mounted, said cams being raised so that the diaphragme of one set will move towards the Y cylinder while the other set is moved away from the cylinder; means for connecting they diaphragme Von one side of the cylinderwith those on the oppositeside; a rocker connecting one set of diaphragme with the other set on theside of the machine opposite the shaft; a block on which the rocker is mounted; and means for adjusting the block. Y

9. The combination in a rotary screen, of a vat; .a cylinder in the vat; means for rotating the'cylinder; two'sete of diaphragme Vmeans for adjusting the block; bumpers located back of the ends ofthe rocker; and a beam secured tothe frame'of the machine.

and carrying the bumpers and the pivot block for'the rocker. j

l JOSEPH A. ,WHITE into the interior of the screen; an outlet communicating with the vat; diaphragme in l the vat; means for vibrating thel diaphragme towards and from the screen, the parts being so arranged that when the machine is in operation a. film of bre forms-against the inner faces `of the plates of the screen, making a perfect filter for catching fine tailings; and means for constantly discharging the film at one end of the machine, the film carrying with it the fine dirt that would otherwise pass through the slots of the screen.

7. The,y combination in a rotary screen, of

a vat; a cylinder in the vat; means for rotating the cylinder; two sets of diaphragms between the cylinderand the bottom of the,

vat; a cam for operatingV each-set of diaphragme; a shaft on which the cams are mounted, said cams beingraised so lthat the v diaphragme of one set will move towards-the cylinder while the other set ie moved away l from the cylinder; means for connecting the diaphragme on one side of the cylinder with those on the opposite side; and a rocker connecting one set of diaphragme with the other Y f set on the side of the machine opposite thel shaft.

8.-` The combination in a rotary screen, of 

